REmapper Update 1

Remapper update fixing unbounded execution and adding {2,4}-way mirroring

Repo hexylena/remapper
Post as of
Tags gamedev,mapgen

Quick remapper update:

  • Finally fixed unbounded execution
  • N-way mirroring (for values of N in (1, 2, 4))

Starting to produce nicer maps! But still a few pain points that must be solved first.

Unbounded execution

Originally the code had the bad behaviour that looked more or less like this:

room_count = 0
while True:
    if room_count > wanted_rooms:

    pos = random_position()
    room = random_room()

    if room.can_place_at(pos):
        room_count += 1

This has now bee replaced with something that results in bounded execution which should be a huge improvement for user-friendliness. The new code looks like

room_count = 0
while True:
    if room_count > wanted_rooms:

    if available_positions() == 0:

    pos = random_position()

    for room in random_room_possibilities():
        if room.can_place_at(pos):
            room_count += 1

Or, as a diff:

     if room_count > wanted_rooms:

+    if available_positions() == 0:
+        break
     pos = random_position()
-    room = random_room()
+    rooms = random_room_possibilities()

-    if room.can_place_at(pos):
-        room.place_at(pos)
-        room_count += 1
+    for room in rooms:
+        if room.can_place_at(pos):
+            room.place_at(pos)
+            room_count += 1
+            break
+    else:
+        remove_position(pos)

Now the code generates the complete set of possibilities and will test them sequentially. If it fails to place anything, it removes the position from the set.

N-way mirroring

Originally room placement code was done in the CLI scripts. This was moved into UPM which can now place 1, 2, or 4 copies of the room as desired.

Codename "Mannheim"

This looks very, very like a CTF map. I should probably implement some facilities for this eventually. Given how well this turned out, it could work quite well for those game modes. We’d want to ensure that the number of routes was sufficiently high, but this is a planned feature anyway.

Current Issues

  1. Not enough circuits, there are some places you have to jump because they’re sortof dead ends.

    So far I’ve been using dumb luck to get good maps. There are currently two phases:

    1. extend walkways from initial seed
    2. add “endcaps” (completely dead ends that prevent you from walking off into space.

    I’m planning to make it three phases:

    1. extend walkways from initial seed
    2. attempt to connect nearby doorways
    3. add endcaps to remaining doors.

    That should help increase the number of possible circuits (speaking in graph terms) which would be a huge improvement. Not sure how to do this, it is easy in the simple case (two doorways facing each other, separated by 1 or 3 spaces) but there are more complex cases that are most certainly not trivial to handle (two doorways not facing each other, or two doorways facing each other which are vertically / horizontally offset)

    Surely there are better ways to generate networks between nodes that are highly connected but conform to the rules provided by the available tile sets?

  2. There’s a place (in Mannheim) where you come down the stairs and it’s a relatively flat area but there are low walls that you can’t walk over and you have to awkwardly go around.

    I’m thinking about the ways to “erase” walls when there are two walls next to each other that do nothing useful. Not sure how to implement this yet. Same with the randOpts of the “old” pieces, how to handle N variations of a part without requiring building N completely different models.

Adding New Parts

Since I never documented this anywhere else… adding new “tiles” to the tilesets is pretty easy. As of the commit mentioned at the top of the page, you can do the following:


  1. Obtain goxel
  2. Some commands:

     git clone
     cd remapper
     git checkout 03d366b32bd1344c83d684a9c2f3baa860c27a67
     git checkout -b my-new-rooms

Adding Your Model

  1. Choose a name for your work. It should be compatible with python package names (so [A-Za-z_][A-Za-z0-9_], (alphanumeric starting with alpha.)) We’ll use castle for the remainder of this example.
  2. Make a directory in redeclipse/prefabs/<your chosen name>/, e.g. redeclipse/prefabs/castle/
  3. Build a room in goxel. Try to stick to 8x8x8 cubes, and to fill them up completely on the x and y axes. (This is a strange restriction, but I haven’t nailed down a good way to handle this otherwise, unfortunately.)

    This means that if you want to design a small platform, make sure that the base is at least 8x8, it doesn’t matter how tall it is.

    You can place voxels in as many 8x8x8 cubes as you need. E.g.

    Example of a tile in the tile set

    Note here that the bottom 8x8x8 cube on the near side is completely “filled” to the extent of the cube that would be considered occupied. (I know this is a terrible explanation, sorry. Just try and fill out to the edges of 8x8x8 cubes at the ±x/y faces.)

    Save your room to redeclipse/prefabs/<your chosen name>/<your model name>.gox, e.g. redeclipse/prefabs/castle/castle_wall.gox.

  4. Edit the Makefile in the root of the project. You’ll need to add your directory to the end of the definition of GOX_FILES

    Currently it looks like the following (with only the first entry shown, there are more but it makes the example obnoxiously long):

    GOX_FILES := $(wildcard redeclipse/prefabs/original/*.gox)

    You’ll need to add your folder to the end of this list, e.g.

    GOX_FILES := $(wildcard redeclipse/prefabs/original/*.gox) $(wildcard redeclipse/prefabs/<your folder name>/*.gox)
  5. Now you can must run make vox_files whenever your .gox files change. It doesn’t hurt to run it if they haven’t, the makefile is configured to only convert the models if needed.

Writing the Python Code

First, create an in that folder, e.g. redeclipse/prefabs/castle/ You’ll probably want to import the following by default:

   import os

   from redeclipse.prefabs.magica import MagicaRoom
   from redeclipse.vector.orientations import EAST, SOUTH, ABOVE, WEST, NORTH
   from redeclipse.prefabs import LIGHTMAN

For each .gox model that you’ve built, you’ll want to define a python class for this, representing the model.

We’ll go through the following example from one of the castle pieces:

class castle_gate(MagicaRoom):
    name = 'castle_gate'
    vox_file = os.path.abspath(__file__).replace('', 'castle_gate.vox')
    room_type = 'setpiece_medium'

    doors = [
        {'orientation': WEST, 'offset': WEST + NORTH + ABOVE},
        {'orientation': EAST, 'offset': EAST + EAST + EAST + NORTH + ABOVE},
        {'orientation': NORTH, 'offset': EAST + NORTH + NORTH + NORTH},
        {'orientation': SOUTH, 'offset': EAST + SOUTH},

We’ve given the class an abritrary name, castle_gate. For simplicity we’ve used the same name as we gave the .gox file (and thus also the automatically built .vox file)

This class has a name = attribute which is set to the same thing. This is really super redundant and will probably be removed in the future.

Next, it specifies a vox_file = os.path... attribute which is also somewhat redundant and will probably be removed in the future. For now, just copy that and replace castle_gate with whatever you named your class.

Lastly, we define a list of doors, each of which consists of a dictionary containing orientation and offset.

The orientation specifies which way the door faces, and this, by definition, should be away from the model. Note that the door with the orientation west is offset to the west + north + above. This should make sense, the door to the west of the model faces west, to the east of the model faces east.

If you aren’t sure which way your model faces, you can run the helper script

python redeclipse/cli/ redeclipse/prefabs/<your chosen name>/<your model name>.vox
# e.g.
python redeclipse/cli/ redeclipse/prefabs/original/spawn_room.vox

(Note the .vox extension.) This will print out “slices” of the model from bottom to top, like an MRI.

==== z = 0 ====
y ########
y ########
y ########
y ########
y ########
y ########
y ########
y ########
==== z = 1 ====
y ########
y #      #
y #      #
y #      #
y #      #
y #      #
y #      #
y #      #

Here we can see a door to the +y direction as evidenced by the border on the ±x and -y sides of the box. Use the following table for converting to an orientation:

Direction Orientation


You may need to add extra lights. They’re added relative to the smalled x / smallest y 8x8x8 cube in your model.

def render_extra(self, world, xmap):
    LIGHTMAN.light(xmap, self.pos + ABOVE)

By default the LIGHTMAN lights the block in the center of the 8x8x8 cube. If you don’t define this function on your class, it will do just that which may or may not be right. In the above example we add ABOVE to the position to move it one cube above since many of the castle tile set include a solid cube below them (as part of the “castle wall” effect.)

However, if you need to offset that light to another 8x8x8 cube, you’ll need to do something more complex:

LIGHTMAN.light(xmap, self.pos + (EAST + EAST + ABOVE).rotate(self.orientation))

This places the light two positions to the EAST (+y) and one 8x8x8 unit above. Any positional offsets must be grouped in parentheses and a .rotate(self.orientation) applied at the end.

Checking the Output

  1. Open up redeclipse/cli/ in your editor.
  2. Add your folder name to this line
  3. Include your class name in magica_classes. If you named your folder castle and your model castle_gate, then you’d add castle.castle_gate, to the magica_classes variable.
  4. Run python redeclipse/cli/ --magica which will produce a set of .vox files for each and every model in magica_classes.
  5. Open this in goxel, it should look something like:

    Example of a test room in goxel

    Note the small 4x4 blocks in “front” of each of the doorways. This lets you test that you’ve got the doorways correctly defined. The room is output in every rotation as a further test that everything is working properly.

  6. If everything looks good, you’re ready to add it into the main room generation script. You’ll want to edit redeclipse/cli/, add your project name to the import list on line 15, and then add your project.model_names to the possible_rooms array (same as magica_classes)
  7. Run it!

    python redeclipse/cli/ maps/empty-day.mpz \
         --seed 42 --rooms 200 \
         --mpz_out ~/.redeclipse/maps/test.mpz
  8. Launch redeclipse and open the map. <backtick>/map test<enter>